This is a vintage 7025/12AX7WA vacuum tube made in Russia, housed in its original case. This tube was manufactured with the aim of maintaining high performance, low noise, and long life, and was primarily used in military communication equipment. The internal structure and materials of this 7025 are completely different from those of a standard 12AX7. I have tested it and confirmed that it produces sound before listing it. Please take a look at the photos and consider purchasing it.